val1 = '12'
val2 = 'hello'
val3 = [1, 2, 3]
val4 = (1, 2, 3)
val5 = '[1, 2, 3]'
val6 = '(1, 2, 3)'

print(tuple(val3))
print(list(val4))

# eval() --计算在字符串中的有效Python表达式,并返回一个对象
print(eval(val1))
print(eval(val5))
print(eval(val6))
